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Finding the Fourth Proportional to 131,280.40, 197,017.80 and 86,892.40

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Solution

The fourth proportional to 131,280.40, 197,017.80 and 86,892.40 is: 130,402.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,280.40 : 197,017.80 = 86,892.40 : x
  2. Step 2: Convert to fraction form
    131,280.40/197,017.80 = 86,892.40/x
  3. Step 3: Cross multiply
    131,280.40x = 197,017.80 × 86,892.40
  4. Step 4: Simplify right side
    131,280.40x = 17,119,349,484.72
  5. Step 5: Solve for x
    x = 17,119,349,484.72/131,280.40
  6. Step 6: Final answer
    x = 130,402.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.